<template>
  <div class="goods">
    <div class="menu-wrapper" ref="menuWrapper">
      <ul>
        <li v-for="(item,index) in goods" :key="index" class="menu-item"
            :class="{'current':currentIndex === index}" @click="selectMenu(index,$event)">
          <span class="text border-1px" >
            <span v-show="item.type>0" class="icon" :class="classMap[item
            .type]"></span>{{item.name}}
          </span>
        </li>
      </ul>
    </div>
    <div class="foods-wrapper" ref="foodsWrapper">
      <ul>
        <li v-for="(item,index) in goods" :key="index" class="food-list food-list-hook">
          <h1 class="title">{{item.name}}</h1>
          <ul>
            <li v-for="(food, findex) in item.foods" class="food-item" :key="findex">
              <div class="icon">
                <img width="57" height="57" :src="food.icon"/>
              </div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <p class="desc">{{food.description}}</p>
                <div class="extra">
                  <span class="count">月售{{food.sellCount}}份</span>
                  <span>好评率{{food.rating}}</span>
                </div>
                <div class="price">
                  <span class="now">￥{{food.price}}</span><span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cartcontrol :food="food"></cartcontrol>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <shopcart :deliveryPrice="seller.deliveryPrice" :minPrice="seller.minPrice"
              :selectFoods="selectFoods()" ref="shopcart"></shopcart>
  </div>
</template>

<script type="text/ecmascript-6">
  import BScroll from 'better-scroll'
  import shopcart from '@/components/shopcart/shopcart'
  import cartcontrol from '@/components/cartcontrol/cartcontrol'
  const ERR_OK = 0
    export default {
      props: {
        seller: {
          type: Object
        }
      },
      data () {
        return {
          goods: [],
          listHeight: [],
          scrollY: 0
        }
      },
      computed: {
        currentIndex () {
          for (let i = 0; i < this.listHeight.length; i++) {
            let height1 = this.listHeight[i]
            let height2 = this.listHeight[i + 1]
            if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
              return i
            }
          }
          return 0
        }
      },
      created () {
        console.info('---------------')
        this.classMap = ['decrease', 'discount', 'special', 'invoice', 'guarantee']
        this.$http.get('/api/goods').then((response) => {
          response = response.body
          if (response.errno === ERR_OK) {
            this.goods = response.data
            this.$nextTick(() => {
              this._initScroll()
              this._calculateHeight()
              // this.$store.state.shopcart = this.$refs.shopcart
            })
          }
        })
      },
      methods: {
        selectMenu (index, event) {
          if (!event._constructed) {
            return
          }
          // console.info(index)
          let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook')
          let el = foodList[index]
          this.foodsScroll.scrollToElement(el, 500)
        },
        _initScroll () {
          this.menuScroll = new BScroll(this.$refs.menuWrapper, {
            click: true
          })

          this.foodsScroll = new BScroll(this.$refs.foodsWrapper, {
            click: true,
            probeType: 3
          })
          this.foodsScroll.on('scroll', (pos) => {
            this.scrollY = Math.abs(Math.round(pos.y))
          })
        },
        _calculateHeight () {
          let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook')
          let height = 0
          this.listHeight.push(height)
          for (let i = 0; i < foodList.length; i++) {
            let item = foodList[i]
            height += item.clientHeight
            this.listHeight.push(height)
          }
        },
        selectFoods () {
          let foods = []
          this.goods.forEach((good) => {
            good.foods.forEach((food) => {
              if (food.count) {
                foods.push(food)
              }
            })
          })
          return foods
        }
      },
      components: {
        shopcart,
        cartcontrol
      }
    }
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl"
  .goods
    display flex
    position absolute
    top 174px
    bottom 46px
    width 100%
    overflow hidden
    .menu-wrapper
      flex: 0 0 80px
      width 80px
      background #f3f5f7
      .menu-item
        display table
        height 54px
        width 56px
        padding 0 12px
        line-height 14px
        .icon
          display inline-block
          width 16px
          height 16px
          vertical-align top
          margin-right 2px
          background-size 16px 16px
          background-repeat no-repeat
          &.decrease
            bg-image('decrease_3')
          &.discount
            bg-image('discount_3')
          &.guarantee
            bg-image('guarantee_3')
          &.invoice
            bg-image('invoice_3')
          &.special
            bg-image('special_3')
        .text
          display table-cell
          width 56px
          vertical-align middle
          border-1px(rgba(7,17,27,0.1))
          font-size 12px
        &.current
          position relative
          z-index 10
          margin-top -1px
          background white
          font-weight 700
          .text
            border-none()
    .foods-wrapper
      flex 1
      .title
        padding-left 14px
        height 26px
        line-height 26px
        border-left 2px solid #d9dee01
        font-size 12px
        color rgb(147, 153, 159)
        background #f3f5f7
      .food-item
        display: flex
        margin 18px
        padding-bottom 18pxwrapper
        border-1px(rgba(7,17,27,0.1))
        &:last-child
          border-none()
          margin-bottom 0
        .icon
          flex 0 0 57px
          margin-right 10px
        .content
          flex 1
          .name
            margin 2px 0 8px 0
            height 14px
            line-height 14px
            font-size 14px
            color rgb(7,17,27)
          .desc, .extra
            line-height 10px
            font-size 10px
            color rgb(147,153, 159)
          .desc
            margin-bottom 8px
            line-height 12px
            font-size 12px
          .extra
            .count
              margin-right 6px
          .price
            font-weight 700
            line-height 24px
            .now
              margin-right 8px
              font-size 14px
              color red
            .old
              text-decoration line-through
              font-size 10px
              color #7e8c8d
          .cartcontrol-wrapper
            position absolute
            right 0
            bottom -5px
</style>
